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If you want to make a pipe out of sheet metal and you want to close the rounded material
with a seam, there are two options. First, you use the Pittsburgh lock former machine and
3-roller bending machine a seam on both ends of the blank. After the first run, you flip the
workpiece so that the two seams face in different directions. Then you round the sheet on
a 3-roller bending machine and hang the two folds in each other.